Results 61 to 70 of about 2,407 (159)

A Study of Gas and Rain Propagation Effects at 48 GHz for HAP Scenarios

EURASIP Journal on Wireless Communications and Networking, 2008
The atmosphere and rainfall significantly limit the performance of millimeter wave links and this has to be taken into account, particularly, during planning of high altitude platform (HAP) networks.
P. Pechac, M. Mazanek, P. Piksa, S. Zvanovec   +3 more
doaj   +1 more source

Color Symmetry Breaking in a Nonlinear Optical Microresonator

Laser &Photonics Reviews, EarlyView.
A two‐color pump drives an integrated microring resonator into spontaneous color symmetry breaking mediated by the nonlinear Kerr effect. Above threshold, one optical color becomes spontaneously dominant while the other is submissive, with the selected output state emerging randomly. These results establish a new form of symmetry breaking in integrated
Luca O. Trinchão, Alekhya Ghosh, Arghadeep Pal, Haochen Yan, Toby Bi, Shuangyou Zhang, Nathalia B. Tomazio, Flore K. Kunst, Lewis Hill, Gustavo S. Wiederhecker, Pascal Del'Haye   +10 more
wiley   +1 more source

Gradient‐Structured Polymer Fiber Mats for Broadly Tunable Multicolor and White Lasing

Laser &Photonics Reviews, EarlyView.
Hierarchically engineered electrospun fiber mats containing separated red, green, and blue dyes enable highly tunable multicolor and white random lasing. Spatially controlled dye distribution suppresses energy transfer, allowing precise color adjustment across wide color gamuts and accurate reproduction of daylight white standards.
Alina Szukalska, Kinga Halicka‐Stępień, Jastin Popławski, Katarzyna Kołodzińska, Michal Majkowski, Joanna Cabaj, Lech Sznitko   +6 more
wiley   +1 more source

Plasmon-Induced Transparency in an Asymmetric Bowtie Structure

Nanoscale Research Letters, 2019
Plasmon-induced transparency is an efficient way to mimic electromagnetically induced transparency, which can eliminate the opaque effect of medium to the propagating electromagnetic wave.
Wei Wei, Xin Yan, Bing Shen, Xia Zhang
doaj   +1 more source

High-Gain Wideband Circularly Polarised Fabry-Perot Resonator Array Antenna Using a Single-Layered Pixelated PRS for Millimetre-Wave Applications. [PDF]

Micromachines (Basel), 2022
Melouki N, Hocini A, Fegriche FZ, PourMohammadi P, Naseri H, Iqbal A, Denidni TA.   +6 more
europepmc   +1 more source

Side‐DBR Guided Exciton‐Polariton Lasing With Near‐Field Mode Imaging in an InGaN Thin‐Film Ridge Waveguide

Laser &Photonics Reviews, EarlyView.
Room‐temperature lower‐polariton‐like lasing is realized in an InGaN/GaN thin‐film ridge cavity with lateral distributed Bragg reflectors. Near‐field optical microscopy distinguishes the transverse side‐DBR‐confined mode from a longitudinal photon‐like mode, while simulations reproduce their spatial profiles.
Wai Yuen Fu, Yuk Fai Cheung, Hoi Wai Choi   +2 more
wiley   +1 more source

Electrostatic steering of thermal emission with active metasurface control of delocalized modes

Nature Communications
We theoretically describe and experimentally demonstrate a graphene-integrated metasurface structure that enables electrically-tunable directional control of thermal emission.
Joel Siegel, Shinho Kim, Margaret Fortman, Chenghao Wan, Mikhail A. Kats, Philip W. C. Hon, Luke Sweatlock, Min Seok Jang, Victor Watson Brar   +8 more
doaj   +1 more source

All-Optically Controlled Quantum Memory for Light with a Cavity-Optomechanical System

Entropy, 2013
Optomechanics may be viewed as a light-mechanics interface to realize hybrid structures for (classical or quantum) information processing, switching or storage.
Ka-Di Zhu, Wen Bin, Jinjin Li
doaj   +1 more source

Intensity Noise Dynamics in Terahertz Quantum Cascade Lasers

Laser &Photonics Reviews, EarlyView.
Intensity‐noise dynamics in terahertz quantum cascade lasers are investigated across single‐mode, dense‐comb and harmonic‐comb regimes using graphene thermoelectric detectors. Harmonic combs show ∼10% lower relative intensity noise, while RIN scales as P0−γ$P_0^{ - \gamma }$ with γ≈1.2$\gamma \approx 1.2$, revealing a crossover from spontaneous ...
M. Alejandro Justo‐Guerrero, Leonardo Viti, Vladimir Pushkarev, Lianhe Li, Edmund H. Linfield, Miriam S. Vitiello   +5 more
wiley   +1 more source

Room‐Temperature Polariton Condensation Into Superscar Modes in Growth‐Defined Triangular Micro‐Prism Resonators

Laser &Photonics Reviews, EarlyView.
High‐Q superscar modes in growth‐defined triangular GaN micro‐prism resonators enable strong exciton–photon coupling and room‐temperature polariton condensation, offering a scalable platform for integrated III‐nitride polariton devices. ABSTRACT Group III‐nitride semiconductors are regarded as key materials for realizing polariton devices operating at ...
Chan‐Young Sung, Jungwon Kim, Daegwang Choi, Hyun Gyu Song, Yong‐Hoon Cho   +4 more
wiley   +1 more source